Floquet topological phases with fourfold-degenerate edge modes in a driven spin-1/2 Creutz ladder

doi:10.1103/PhysRevA.101.033607

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	Floquet topological phases with fourfold-degenerate edge modes in a driven spin-1/2 Creutz ladder
	Zhou, Longwen 1; Du, Qianqian
刊名	PHYSICAL REVIEW A
	2020
卷号	101 期号:3 页码:33607
关键词	CHIRAL-SYMMETRY STATES SURFACE
ISSN号	2469-9926
DOI	10.1103/PhysRevA.101.033607
英文摘要	Floquet engineering has the advantage of generating new phases with large topological invariants and many edge states by simple driving protocols. In this work, we propose an approach to obtain Floquet topological phases with fourfold-degenerate edge states and even-integer topological invariants in a spin-1/2 Creutz ladder model, which is realizable in current experiments. Putting the ladder under periodic quenches, we found rich Floquet topological phases in the system, which belong to the symmetry class CII. Each of these phases is characterized by a pair of even integer topological invariants (w(0), w(pi)) is an element of 2Z x 2Z, which can take arbitrarily large values with the increase of driving parameters. Under the open boundary condition, we further obtain multiple quartets of topological edge states with quasienergies zero and pi in the system. Their numbers are determined by the bulk topological invariants (w(0), w(pi)) due to the bulk-edge correspondence. Finally, we propose a way to dynamically probe the Floquet topological phases in our system by measuring a generalized mean chiral displacement. Our findings thus enrich the family of Floquet topological matter, and put forward the detection of their topological properties.
学科主题	Optics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/26985]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Ocean Univ China, Dept Phys, Coll Informat Sci & Engn, Qingdao 266100, Peoples R China 2.Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Longwen,Du, Qianqian. Floquet topological phases with fourfold-degenerate edge modes in a driven spin-1/2 Creutz ladder[J]. PHYSICAL REVIEW A,2020,101(3):33607.
APA	Zhou, Longwen,&Du, Qianqian.(2020).Floquet topological phases with fourfold-degenerate edge modes in a driven spin-1/2 Creutz ladder.PHYSICAL REVIEW A,101(3),33607.
MLA	Zhou, Longwen,et al."Floquet topological phases with fourfold-degenerate edge modes in a driven spin-1/2 Creutz ladder".PHYSICAL REVIEW A 101.3(2020):33607.